Shaft-kiln construction



1,630,489 y s. w. JAMESON SHAFT KILN CONSTRUCTION Filed April 25. 1924 ATP RNEY smww IN'VEINTD I Patented May' 31, 1927.

UNITED STATES STEWART W. JAMESON, OF DULUTH, MINNESOTA.

SHAFT-KILN CONSTRUCTION.

i Application filed April 25, 1924. Serial No. 708,865.

This invention relates to kilns.

This invention has utility in connection with shaft kilns for calcining rock. The structure of this d sclosure is one peculiarly adapted for handling limestone in quantity with a minimizing of matters of upkeep due to the temperature take-up features. Fur

thermore, the ten'iperature is dissipated in its development about the kiln not only in the base structure but in the lining as to the shell structure.

Referring to the drawings:

Fig. 1 is a plan view, with parts broken away, of a cylindrical type of shaft kiln;

Fig. 2 a frag gmentary side elevation of the kiln of Fig. 1;

Fig. 3 is a detail view of the discharge valve or gate for the kiln;

Fig. 1 is a detail view of jo nt between sections of a shell showing in dotted lines the take-up or flange distortion of such joint;

Fig. 5 is a fragmentary plan view of a battery or wall of rectangular kilns; and

Fig. 6 is a partial side elevation of the kilns of Fig. 5.

Support or base 1 is shown as having thereon furnaces 2 in communication with flue 3 of cylindrical shaft kiln having refractory lining 4, backing masonry lining 5, and insulation lining 6. These linings 4:, 5, 6, are housed by a metallic shell herein shown as sections 7 having outwardly extending terminalflanges 8, and therebetween upper and lower outwardly extending flanges 9. In practice, it may be economical to have the flanges 8 integral with the sheet or section extent, while when this sheet or section is out of a plane the connecting upper and lower flanges are advantageously formed and connected to the section 7 These flanges 8, 9, serve as stiitening or reinforcing means for the shell section. These shell sections provide joints 1O vertically extending, in tersecting joints 11 horizontally extending, thereby providing tour-corner. joints between sections. These sections are independently removable, thereby permitting repair of any local defect in any of the kiln linings. The shell sections, due to their flange assembly, while sufficiently substantial to withstand holding strains from the kiln linings, still involve features of yield.

ing circumterentially. This yielding is an enlargement take up due to the outward spacing of asseu'iblingbolts or rivetslQ as connecting the flanges 8. As the linings expand, due to warming up of the kiln, the flanges 8 may distort or slant toward each other as the linings enlarge. This means that throwing strains on the section assembly means may not be disastrous. It further means that the shell section holding is efiective for maintenance of continuous shell assembly. This avoids any crushing or disintegration strains upon a lining. It means that the voids in the insulation are not eliminated. This is a factor in maintaining the eifectiveness oi the insulation. The vertical or longitudinal expansion, of course, may be outward from the shell, but in the event of adherence, any strains between the flanges 9 as united by the bolts or rivets 12 may be automatically cared for by flange distortion as in the cooperation between the flanges 8.

vVhen a kiln is shown as built up from a main support or floor 1, there is provided therebelow a discharge floor 13. From the kiln flue 8, there is a downwardly extending chute or cone ll having a terminal opening 15. Into this cone, the calcined rock, say from lime carbonate to quick lime, travels and is in a heated state approximating incandescence as the calcining temperature may run in the flue 3 to 1700 ll. or greater. This chute 1 1 is a region in which it is desired to have the temperature lowered without detracting from the efficiency 01. the kiln operation. The great load carried by the main support or floor 1 may be accomplished by girders or boxed beams 16, herein shown as provided with lattice filling 17 in the region of the upper portion of the chute 14. This means that there is no trapping of the highly heated air as rising about the unlined chute 14, but thatsuch air may freely pass away from the upper region of this cone or chute 14, thereby increasing the rate or cooling for the cone 14.

As the quick lime in the cone 14 has its temperature reduced such may be withdrawn at intervals as desired. To this end, the opening 15 has on opposite sides there of, guides 18, 19, in which members 20 are reciprocable toward each other into valve closing position at. the opening 15. Each of these members 20 has link 21 extending therefrom. Second-class lever 22 is con nected to one of the links 21 and fulcrumed on theguide 18. The other link 21 is connected to first-class lever 23, fulerume'd on the guide 19. (Fig. 3). Link 2 between the levers 22, 23, completes this assembly of the valve or gate conttrol mechanism in a common plane so that rocking of the lever 23 toward the lever 22 will resultin opening" the valve .for lime discharge from the opening 15, while reverse swing ofthis lever 23' will simultaneously shift the members as slidable along the guides 18, 19, into closed position for theopening, 15.

Flues 25 are shown as rectangular and with series of linings 26, 27,28, assembled to form a wall hollow at the flues 25. This (Figs. 5, 6) type of shaft kiln has economy. in reducing the volume of radiation. by reducing the exposed area ofthe kiln. Furthermore there is manimuinflue areafor the general kiln space occupied. This wall is shown as housed by sections29 having upper and lower flanges 30, end flanges 31, as to the side section. This section 29 is further stiffened by I-beams held by truss-rods 33 extending between flanges 31 into assembly with the section 29. They have four-corner joints with the adjacent sections. but in the intermediate region betweenthe fines 25 tieplates 34. may break joints, andthereby one plate serves as a tie-means for sections as meeting on the outside. Filler plat-e portions 35 may be disposed betweentheflanges 31 as to the opening between successive tieplates Set. These tie-plates 34: are preferably" of less gauge than the outer shell sections 29,.but in any event, the assembly of such sections 34; to be anchored to saidshell=at the flangesr3l is such that bolts or rivets 12 may have greater shear resistance than the pull of. the. tie-plates 3st so that the holes inthe tie-plates 34 are enlarged. by expansion strains, and the bolts 12 holdiup for maintaining assembly between the flanges 31. At the end ofthe wallplates or shell sections 36 are shownha ving flanges 30, 31, withthe stiffening. I-beams 32 and tie-rods 33. These sections 36, 29,.are independently removable for purposes offlue up-keep. Angle corners 37 connect the flanges 31 of the plates 29, 36.-

lVhat is claimed and it is desired to secure by United States Betters Patent is:

1. A shaft kiln structure embodying refractory lining means, a shell for said lining, said shellcomprising sections having flanges bounding on a common section side and extending at an angle to the section extent, said flanges of adjacent sections approximating parallel" relation, and means offset from the directional extent of one section for connecting its flanges with the flanges of the abutting sections, whereby kiln lining expansion strains may distort said flanges with the connecting means still effective.

2. A shaft kiln structure embodying 1e fractory lining means, and a shell for said lining comprising peripherally flanged sections independently remo able and providing four-corner meeting jointsbetween said sections, said flanges being exteriorly accessible and exposing. flange connecting means accessible exteriorly ofthe kiln,

3. A shaft kiln embodying alining, a shell exterior of the lining comprising a stiffened laterally removable section for exposing. the lining, said section having an endless outwardly projecting flange directed away from the lining, and exteriorly exposed flangeengaging means for assembling the section in the shell to envelop said lining.

4. A shaft kiln provided with a metal shell, a support therefor including a beam having transversely thereof openings therethrough, and a chute for said kiln depending from the shell and extending below said beam, whereby the openings in the beam permit free air circulation aboutthe chute adjacent the base transversely of the beam.

5. Shaft kilns en'ibodying adjacent refractory linings as a continuous wall, aconn'uon shell for a plurality of saidkilns embodying sections having joints terminating between the shaft portions of said kilns, and tie means extending between the liningsof adjacentkilns and anchored with the shell at said oint-s.

In witness whereof I aflix my signature.

STEWART W. JAMESON. 

